/Engine/Source/Runtime/Engine/Classes/Animation/AnimCompress.h
Called to generate a unique DDC key for this codec instance and input anim sequence and TargetPlatform A suitable key should be generated from: the InstanceGuid, a codec version, and all relevant properties that drive the behavior.
virtual void PopulateDDCKey ( const [UE::Anim::Compression::FAnimDDCKeyArgs](API\Runtime\Engine\Animation\FAnimDDCKeyArgs) & KeyArgs, [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar )